I can confirm this as well.
Duplicates https://mojang.atlassian.net/browse/MC-35848
Duplicates https://mojang.atlassian.net/browse/MC-35848
Getting the same problem, using Win 7-64 and AMD HD6990 with cataclyst 13.4. Duplicates https://mojang.atlassian.net/browse/MC-35848
The logic is that (0,0) is in a corner. Makes perfect sense from a programming standpoint.
I'd prefer (0,0) to be center, but I can live with the current setup.