Thanks, fengda2870 for pointing it out.
I added two rather critical fixes to Apophysis 7x15c:
+ Fixed post_curl variation by doing the following on Zueuk's suggestion (more below)
+ Fixed a bug which created a spiral (why so ever) on the blur variation when using multithreading
post_curl_c3 got removed and post_curl was made a simple, 3D aware variation (Z-passthrough)
The functionality of the former, built-in post_curl was renamed to post_curl3D which essentially a post'ified curl3D where the latest post_curl behaves like the plugin (except for the Z-passthrough)
This fix was done as a result of the recent CDA.
The problem that the blur-variations as well as the crop-variations might malfunction if you use MT and render anything non-transparent PNG is known and subject to fix in a later release, still. The fix for the spiral problem is kind of rough and has a (very very tiny) impact on the performance. Most likely, you won't notice it. But I want a better fix in there too