Question: When I compile our project use Delphi 2010 Trial, there has a fatal error :

[DCC Fatal Error] F2084 Internal Error: L1737

Seem's a internal error. No hint at all. 

Is this a compiler bug or trial limit?

Thanks.

Answer: 
I had the same problem because of generics Dictionary type declaration in the procedure (as Atle mentioned). After moving that type declaration to the top of implementation part of unit - L1737 error disappeared.
I think you're using same library paths with your older delphi versions, therefore using incompatible DCUs.