I am running Maple 13.0 on Ubuntu 9.04 and I'm having Maple give me some strange outputs. 

In this first block of code, I define an expression f which I try to evaluate (unsuccessfully) at a partiuclar value of t and g.   If I expand first, then I get an answer, which is not correct.

I am using Maple 12 build 347164 for research (as a grad. student) on Windows XP.

I have written a simple block of code to do some calculations repeatedly.  However, everytime I run the code, the amount of memory Maple is using increases (3-4 MB per time).  I am simply running the code again, and the size blossoms.  I have made sure that none of my variables are expanding (e.g., a list that isn't cleared).  This is troublesome because after 30-40 runs Maple is using over 800MB and my computer has only 2GB of RAM.