- What exactly does this "rebuild using DDF Builder" entail?
- Are you excluding the data files (and DDFs) from anti-virus/anti-spyware programs? I've seen error 46 when an AV scans the file and the engine tries to write to it.
Again, the ECAS_API (Error 8505/8517) are not an issue unless you're trying to use a workgroup engine. Change the setting I suggested in my first posting and see if it's fixed.