@crazyeti who ever uses command line anymore?  Of course some people still do.  The bug was never noticed.  Most everyone uses the standard interface or classic.  You can not say ... "I'm not even sure if Maple can give me correct result."  What is more satisfying to Maple users is that Mathematica has had similar problems, giving wrong answers to certain definite integrals by undersimplifying at certain times.  The fact that the bug does not exist in the standard or classical version of Maple says the bug isn't too serious.

For Maple18 and Maple2015 any Maple.hdb file to be used in the help file system within Maple first needs to be converted to the new help .help file system. 

One caveat is that it needs to be run twice in order to work properly

with(HelpTools):
with(Database):

ConvertAll() # will receive error but just ignore the error and run it again.

ConvertAll()

Note: ConvertAll() is not in the Maple help system.
Not all commands in the HelpTools:-Database are in the help system
with(HelpTools:-Database)

I recieved a similar error migrating Robert Israel's Maple Advisor database

with(HelpTools):
with(Database):

ConvertAll()

"Converting c:\\Program Files\\Maple 2015\\lib\\advisor\\maple.hdb to c:\\Program Files\\Maple 2015\\lib\\advisor\\maple.help"
Warning, .hdb help databases are deprecated, 'c:\Program Files\Maple 2015\lib\advisor\maple.hdb' will not be used, see ?HelpTools,Migrate help page for more information
Warning, while loading C:\Users\laptop22\AppData\Local\Temp\helpmigration\maple\file00021.mw - unable to guess appropriate preview

?advisor

         No Matches Found

Simply just running the command again creates the working help database.

ConvertAll()

?advisor

 All help files to the database are now available. 

In Maple 2015 I have been unable to access any of the commands in help.  ?advisor does not bring up the help file for the advisor database.  Unless I've installed it incorrectly or the files don't contain the help topics it's possible there is a 2105 library help bug that won't read in seperate added libname files.

@moeinvh did you ever get it working? 

BTW Error, (in labelledcontourplot) Can''t label parametric contour plot 

...so it looks like the MapleAdvisor database can not handle parametric contour labelling

As long as you have

1/ Created directory c:/MapleAdivsor/advisor    #as long as the last directory in location is named advisor

2/ copied from advisor6.zip maple.hdb    maple.ind and maple.lib into that directory

3/ created a maple.ini file a text editor (notepad) and saved in your c:/Program Files/Maple 17 directory

4/ where the maple.ini file has the entry libname:=`c:/MapleAdvisor/advisor`,libname:

Upon starting Maple, the initialization file will tell Maple to automatically load the advisor database into the library and all the commands in the advisor database will be ready to use.  I suspect you've typed the wrong libname location in your .ini file which is why it is not recognizing the command. 

@Preben Alsholm when copying from a website texts with spaces become annoyances

The underlying value is there, but the error is displayed in the cell.  The only workaround that is to manually put quotes around every cell that has space delimited text. 

@tomleslie I can resize the code edit region, what version of Maple are you using?  ** edit added ** Ok I see Maple 2015.1.. resizing for code edit regions should work for you unless you mean something else.

** edit**

sorry ok you can't resize text.  You could use the magnifying glass in windows.

CRTL + 6 will increase the size for you, but it also increases the size of the whole worksheet as well.  It should be a workaround for you for the time being.

Ok I've figured it out. 

Hover the cursor over the small bottom right box in the spreadsheet (the cursor won't change to a little resizing arrow until you click the mouse button while in that little corner box) then drag away.

@shadi1386 Maple has never had rulers on the sides of it's worksheets.  Unless you were confusing the history with microsoft Word and the markers option in Maple which may have morphed in your memory into thinking at one time Maple had rulers.  I'm pretty sure you were probably using Maple and Word way back then, maybe copying Maple expression into word and so forth and are now just confusing the two. 

The other option is to set up the worksheet with a background plot working in the foreground, now that's an interesting idea (sorry for the diversion),

It is quite timely that all of the solutions in the book will almost be implemented in Maple on the 100 year anniversary of the theory.

@Carl Love I've seen this happen before and I don't know if it's mapleprimes forum operators making adjustments to posts/questions or if spam is being attached to them and deleted.

It is surprising to see India in 2nd place but lots of people wanting to pursue mathematics and engineering in that country not to mention the population levels. 

I'm guessing the membership is not including the spam created accounts?

Re: comment about the number of releases. 

Mathematica releasing more updates per version might just mean they have a lot more problems to fix.

@I_Mariusz Your same argument below saying "It appears that Maple is not a powerfull math software."  Means you are also saynig "It appears that Mathematica is not a powerful math software" because of your above statement.

@I_Mariusz You cannot judge maple based on one question which you haven't found a solution for.