I could only find one version of ACR. In fact, I moved it out of the Plug-Ins folder so PS wouldn't launch with it just to see if LR still thought there was or still would use an active ACR plug-in. Once removed, I did not receive an incompatibility error dialog (it's not there so no compatibility issues I presume), LR automatically rendered a TIFF and opened in PS. Once I placed the plug-in back in its folder, PS now knows ACR is installed and will open raw files but LR apparently does not. It still renders TIFFs and opens in PS (I've restarted just in case that was issue but no change). While I suppose I have my edit functionality back, it's not operating as intended. I've reinstalled LR 4.3 thinking some sort of re-registering of installed components would occur, but no luck. I may try uninstalling PS and re-installing to see if that gets things back to their intended operation.