Don't know how to properly pass this along, so I'll just post it here. And hopefully the forum won't eat the body of my message again.
For quite some time I've been using wings 3D snapshots for the openCL proxy mode, but at some point in the semi-recent past that broke. I don't know when, since I've not been modeling much lately, but now when I start up smooth preview/proxy mode, wings freezes up and then crashes with no report that I can locate. I've experinced this with 220.127.116.11.g5ee2 and 18.104.22.168.g53af2. 1.4.1 itself is not affected, but obviously doesn't have the functionality I want.
If I were to guess I'd put my money on a driver update having broken things. I use an NVidia Geforce 9500 gt, for whatever good that does you.