Hi, tested this file on:

Opensuse 13.1/64
Intel i5 3770K
GTX 760 4 GB (Display)
GTX 560Ti 1.28 GB 448 Cores
Driver 343.19

Blender 2.72

There are 2300 UV-Maps in this file, see in Object Data Slot.
May it is a way to delete them all in one rush but I don´t know it.

Cheers, mib

thanks for getting looked at the file, lol, why is there 2300 UVs there, any idea, bug or ...?

You can manually assign a maximum of 8 UV maps to a mesh. This number goes higher if you join two meshes each with its own number of uniquely named UV maps, but to get to 2300 of them it must be a bug.

Did you use any UV addons on the mesh?

Hi lamoot,

No I did not use any add-ons, apart from layer management add-on, and work spent on project add-on, but as you can see the mesh is quite complex, that is because I used boolean modifier a lot! I joined meshes, made wholes, etc. But how the hell I managed to get 2300 uniquely named UVs in those meshes is beyond my understanding, hardly I used boolean modifier more than 100 times.

BUT anyways, I found a way to remove all those UVs (thanks to mib2berlin for pointing out). I used python script. And it took very long time to do that, blender was totally unresponsive during the process, Iol I knew its deleting them, just because in resource monitor I saw memory usage dropping slowly. File size after that procedure dropped from 1 gb to 1 mb :). The link to the script, If somebody need it, is below.

http://blenderartists.org/forum/showthread.php?254004-Accessing-UV-data-in-Python-script&p=2689074&viewfull=1#post2689074

Campbell, is our max number of 8 UVMaps a strict enforcement? If so, I’d suggest to add an option of cdlayers merging funcs to specify a maximum number of layers in result, and e.g. to fallback to 'by position' merging when 'by name' would generate too much layers (with a nice warning to user)?

@Bastien Montagne (mont29), it should be limited by MAX_MTFACE.