Medium Trust
As I blogged previously we had some issues to make EntLib 2.0 in Medium Trust. It was not the only one.
The most annoying one was that TypeConverters do not work! I found this thread in the MS newsgroups that confirmed it.
This is really an important restriction for ASP.NET control vendors, I'm not sure how they manage to work in medium trust. In our case we could change our implementation and use a custom TypeEditor in design-time.
Another one is that you cannot use OleDb, so using Access is not possible.
Of course everything works if you put the offending assemblies in the GAC but that was not an option ..