Mesh generator error (Unspecified error)

Hello,

i am using Feflow 6.109 and i get an error message when i try to generate a mesh using the generator. I installed the Triangle mesh generator according to the instruction but it brings me the error message anyway for all.
Does anybody could help me with this?
I am working on Win 7/ 64 bit. The error is appearing in both Feflow versions (32 bit and 64 bit). The mesh should be generated for a simple polygon, nothing more.

Thanks in advance
Ludwig

Could you specify more in detail what the error message is about?

The error message is "unspecified error". Unfortunately there is no detailed error message. Just this.
I already reinstalled it and updated all graphic drivers on my PC. But the error is still occurring. Also for the two other grid generators.

What's the structure in the upper left corner? It doesn't completely look like a simple polygon to me. Is there a line overlaying the polygon border?

The problem is not caused by the super mesh. I also tried the generator with a simple rectangle and it showed the same error message.