This crash - refusal to save a standalone actually happens since GG release and all versions. As said I reported it a while back in a private forum.
No reason I can find or would know of - nothing obvious - could be anything the condition of the product. Whatever its something to do with GG. People seem to be getting all kinds of different save issues as is typically the case across different users.
The error messages should give someone at TGC some idea as they have info which I would not understand but Lee would perhaps. These screen shots were posted previously as said.
To be perhaps clearer :
The Save Process does not complete and fails quickly so in the GG saved Games Folder not all folders and files are saved and No .exe's created/ecxist. Any other files that the process might miss - which it should not - are of little importance if you can get even the .exe to compile/ save out.
Irrespective of the current issue in saving the .exe the issue of missing files in the game folders itself has been around since well forever and its about time it was sorted.
EDIT UPDATE :
As I suspected I have a good idea as to the reason my game level would not save and its probably correct. My level was using bespoke entities....
Having tried another level with all out of the box entities the save stand alone .exe works as far as I can tell just fine.
I had suspected this as I had heard someone somewhere else mention this might be the case....
OK if you are modding a GG Steam game or only want to use out of the box content as many users may be happy with and that's fine, but of little use if anyone wants to include their own non stock content.
System : Advent Windows 7 Home Premium 64bit. Intel(R). i5-2310 CPU @ 2.90GHz. 8.00 GB RAM DDR3. Storage : 1389 GB : 1088 GB Free (1389 GB Total). Graphics : NVIDIA GeForce GT 530. Total Available Graphics Memory : 4095 MB. Dedicated : 1024 MB. Shared : 3071 MB. Direct X10