Error when creating TConvert

Hi,

All my apps use encrypted variables in config files.
I updated to v5 and decrypt() is broken.
I read the -208 issue related post.
Tried to follow the solution given but when calling TConvert.Create() I have a -201 error.
The code is run inside a dll.
It worked perfectly before

After testing it in a simple app, decrypt() with the TConvert usage works.
What doesn't is the usage of the config reading routine inside a dll, used into a Windows service by in a multi threaded environment

I would need a code sample, or a project, to investigate.