Hi, Darrel

Nothing special with those asm files ... their compilation ALWAYS create an IDE locking.

I re-installed v 8.63 : still locking

went Back to V 8.60 and everything works fine ...

soooooo, I really think it's a bug !!! ( no line about any projects mods to do in the IDE release notes )

My OS is XP Home SP3 " up to date " ...

Have a happy new year

Alain