Cannot open dmg files in mavericks

After installing Mavericks on my iMac I cannot open dmg-files. All that happens is that the system tells me "The following disk images couldn't be opened", with the reason "no mountable file systems".
Now, all I can find when discussing this issue is that "your download is corrupted" or "check your disk" or "reinstall Mavericks!". I have checked and rechecked the files, they are complete and should work. My disk is checked and I have reinstalled Mavericks but nothing happens.
It seems to be a fairly new/rare problem, I can't find any discussion on this problem elsewhere...

I'm having the same problem. I don't have any answers. But here's some information about what I'm seeing that might help someone sort this out.
I recently upgraded to Mavericks
Both newly downloaded dmg files and ones that were downloaded and sucessfully opened under a previous version of OS X cannot be opened now
I have two user accounts on the same machine. On one I can open dmgs without problem. On the other I get the error.
I'm using the same browser (chrome) on both accounts to download the same disk image, with different results.
Both accounts are admin accounts
I transferred the disk image that opened properly on my main account to the second account's ~/public/drop box folder and the second account could not open the image.

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the different type of file shttp://www.adobe.com/support/downloads/product.jsp?product=39&platform=Macintosh

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Hello! I can't seem to open any .dmg files. Tried with DiskMounter and disk utility but still can't install any new applications.
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Darn...I thought that would do the trick.
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Message was edited by: Hawaiian_Starman

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Cannot open dmg files in mavericks

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