Unable to import ditamap to RH9

First time poster - long time lurker.

I recently installed RH9 onto my Win7 64bit system, and I cannot import any ditamaps.

I've followed all the instructions listed by Adobe, and from this thread: http://forums.adobe.com/message/3218894#3218894 but to no effect.

I keep getting the messsage:

Processing with DITA Open Toolkit failed. No Logs found.

Check DITA Open Toolkit is installed and working.

I know that DITA Open Toolkit is installed and working, as I'm producing DITA output just fine.

Any help or hints is very appreciated