The uber geeks

I can’t get Coherence Mode to work

Written by Colin Devroe on Wednesday, January 31st, 2007 at 12:57 pm. Colin is the founder of ChanceCube and the Community Evangelist for Viddler.

I just upgrade my copy of to the latest beta because I wanted to try out Coherence Mode. I’ve been unable to get it to work properly.

According to Parallels help, it is pretty straight forward to put Parallels into Coherence Mode (just click the Coherence Mode button) and I also have all of the system and software requirements for it to work.

I do not get any errors when I click on Coherence Mode - in fact I don’t get any type of message. I have reported this to the development team through their “Report a bug” feature, though I couldn’t give them too many details since Parallels does not provide any type of error when Coherence Mode does not work properly.

I’ve tried several things that I could think of; like setting my Windows and Mac OS X screen resolutions to be identical (thinking that had something to do with it). I’ve tried switching to Full Screen Mode (which works fine) first, then moving into Coherence Mode. Nothing I seem to try works, and I’ve read just about every form of documentation on the subject that I’ve been able to find.

Anyone have the same problem? Any suggestions on how I might be able to get it to work properly?

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  1. Gravatar

    Have you upgraded Parallels Tools within your Windows installation? That’s the only thing that I can think of.

    Jeff Smith on January 31st, 2007 1:30 pm

  2. Gravatar

    Jeff Smith: I did, after Chris Coleman had told me to do so. And the tools appear to be running properly in the task bar.

    Colin D. Devroe on January 31st, 2007 1:47 pm


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    I have the same problem as well, although mine is more serious as the Parallels used to work perfectyl and 1 week ago, the Conherence mode was disabled, I cannot drag ‘n’ drop files from mac to parallels any more and the resolution does not change at fullscreen mode…

    Mysterious..

    stelabouras on February 1st, 2007 5:33 am


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    i am having the same exact problem, was hoping to read your comments to find an answer….

    nate on February 2nd, 2007 12:09 am

  5. Gravatar

    Nate: When I do find the answer, I will post it here. It could just be that it is because it is a beta version - but I am not sure.

    Colin D. Devroe on February 2nd, 2007 9:20 am


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    here is the trick to get it working I had the same problem and followed these steps and it worked!!!

    Here is the coherence solution - it worked for me:

    1. Let the tools install normally and let the installer reboot the computer
    2. Go into C:\Program Files\Paralllels\Parallels Tools\
    3. Rename cohrence.exe to coherence.exe (i.e. proper spelling)
    4. Uninstall Parallels Tools by going to the Apple Menu, Actions>Install Parallels Tools
    5. The Parallels Tools folders and coherence.exe will remain on the hard drive and they should
    6. Install Parallels Tools again by going the Apple Menu, Actions>Install Parallels Tools
    7. Let the computer reboot and coherence will work!

    Good Luck

    Rob on February 9th, 2007 2:06 am

  7. Gravatar

    Rob: Thanks for your input. This worked for me as well! Again, thank you.

    Colin Devroe on February 9th, 2007 3:52 pm

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