Windows 7 32 bit.
AMD Radeon HD 7310M.
Broken: Blender 2.72b win 32 bit.
Short description of error
The Cycles fcurve modifier stops working after a set ammount of frames, both drivers and actions.
Exact steps for others to reproduce the error
Check the graph editor, F-Curve mode.
Empty.002 should keep rotating in steps over time, though the cycles fmodifier stops working on frame 110.
Check the graph editor Drivers mode.
Empty.001 should move up in steps when rotating Empty clockwise, though the cycles fmodifier stops working near frame 12.4 (720 degrees).
The cycles fmodifer works with no limit in reverse, though stops working after a set amount of frames forward, for some reason.