In my program I have a command similar to

"Log in as different user"

in File menu.

I issues at some point

clear classlib baas

command as part of login process.

After some re-logins, sometimes a gpf in module vfp500.dll occurs or sometimes program hangs.
This error is repeatable, it always occurs after some re-logins,
sometimes in first time and sometimes in some other.

After removing clear classlib command all works OK!
At clear classlib time, a toolbar class is active. However, this command
must clear all not-active class definitions of BAAS but it seems not to
work!

clear classlib command is required since I use expressions containing
FoxPro UDF ( a I() function) in all .caption properties in property sheets of class designer. I use global memory variable in all .fontname properties.

clear classlib causes re-evaluation of class properties when
new user runs a first instance of a class. This allows to select fonts and language set for particular user.
An alternative to this should be to exit to windows and re-enter, but this is very inconvenient.