When going back and forth between using the form editor and testing the form there is a noticable decrease in system response time -- the form editor takes longer to load the form each time it is closed and then re-opened, and all other actions, including saves, take longer as well. Eventually the system crashes resulting in the following error message:

dbtex32.exe - Application Error
The instruction at "0x73dd11c7" referenced memory at "0x00000004". The memory could not be "read." Click OK to terminate the program.