I recently acquired a new Mac mini that has 64 bit OSX 10.7 Lion Server installed. I have a 32 bit app that will not run properly. I am wondering will OSX 10.7 Lion Server run 32 bit apps under a 64 bit kernel?
In general all apps that are built for 32 bit will run properly on OS X whether or not the kernel is booted in 64 bit mode or not.
The notable exceptions are:
Feel free to edit the question into specifics or ask a follow on question listing the error you are getting and more details about the program to the extent you wish to share those details.