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UPDATE #2 -- FAIL!
So, if I turn off my anti-virus and AnyDVD, I can launch ImgBurn. But the linking/launching from within BD-Rebuilder for burning revised Bluray structures still fails, as if it is encountering a similar issue (flashes a window for a half-second and gives a failure notice). Did this with the ImgBurn app already launched as well. Any ideas?
Again, this same software combo is all running fine on the same hardware under a dual-boot of XP Pro 32-bit (just not nearly as fast as its running under Parallels, and not able to take advantage of 64-bit calls/addt'l memory).
Update #2B - Partial Success, the Question Remains...
So, as a test, I took the Blu-ray folder created by BD-Rebuilder and initiated a burn manually in ImgBurn. Worked like a charm. So, the thing going wonky is launching ImgBurn from within BD-Rebuilder. I posted on the Doom9 site and 'jdobbs' said he couldn't think of anything else to try as they didn't have the same prob [in Win 7 pro 64-bit]. Anyone have any ideas on what else I could try? I have a workaround, but something is obviously amiss and smells like a permissions/security issue, which is the big gotcha it seems in Win7.
Thanks! Throw me some bones--PLEASE!