Windows 7: LocalMappedObject fix causes ntdll.dll crash

Hello everyone,

I tried to find some answers on internet but didn't get anything what can really resolve my problem.

I have some troubles with an application I developed. Normally to make it working properly one need to disable UserAccountControl and run it as administrator.



Now, we have the situation where we need to keep UAC active and should run it normally. :/

In order to find out what exactly may causing the problems we used Standard User Analyzer from Microsoft Application Compatibility Toolkit which helped us to figure out that it's LocalMappedObject fix that needs to be applied.

To make it work, we use Compatibility Administrator which allows us to apply Compatibility Fixes\Modes.( we applied only LocalMappedObject fix).

Everything works perfectly with UAC disabled and we don't need to run our application as administrator.

However on some machines where we applied this fix, it's causing famous ntdll.dll crashes with exception code 0xc0000005 and the application cannot even start. This happens even if we run it as Administrator.

To be honest I don't know exactly what could I check in order to resolve this problem. Is there any software it may causing this problem (i.e. outlook)?

Thank you in advance for your help.