When release dlls don't work but debug dlls do

Question

After deploying our huge distributed system to one of our clients we experience an unexpected error. During the investigation we replace the assembly causing the error with

Answer 1

You probably know this, but, variables are sometimes initialised differently in debug and release builds. E.g. I think variables are auto-init'd in VC6 debug builds, this can hide problems if you didn't initialise something. I also think debug arrays may use sentry bytes in an attempt to indicate overruns. This too can lead to different behaviour.