USB Thumb Drive Not Mounting With Mavericks

I have several Thumb drives (FAT32) that no longer mount on my iMac running Mavericks.
The thumb drives do not show up in finder nor do they show up in disc utilities.
The USB bus still seems to work since other USB devices seem to connect to it, but none
of the thumb drives do. I have done an SMC and PRAM reset with no luck. I do not have
TUXERA nor NTFS-3G so nothing their to disable.
I do have a Mac Mini running Mountain Lion and all thumb drives do work with that.
Out of ideas here.

But given that other USB devices work here — what sorts of other USB devices?
I have 2 external hard drives that work on the very same USB port and an external blu-ray drive as well.
Are there any add-on anti-virus or anti-malware "tools" installed?
None. Never have.
To check the USB bus, remove all hubs and all other external USB devices from this Mac, reboot, connect one of the thumb drives directly to the Mac, and try again.
Everything re-connected except for the thumb drives. External hard drive and Blu-ray drives popped right up but no USB flash drives.
Try a different and newly-created login, and see if the flash drives work there.
I used the Guest login and the same thing, everything works except the Thumb drives.
To check the local OS X installation, see if booting this Mac from the recovery partition (if one is present)
None is present.
or booted from another (external) OS X disk allows access to the thumb drives.
I have en extern HD that is blank, but I do not know how to install Mavericks on it then run it.
Is there anything in common among these failing USB disks? Same brand and model? Or a mixture of different thumb drives?
They are all FAT32, other than that no I have Cruzer, Kingston and PNY brands. 2GB 4GB and 16GB.
Are the OS X systems involved both similar configurations, or are they very different versions?
Mac Mini is Mountain Lion and has no issues with the thumb drive.
Intel iMac is Mavericks and my Mac Book Pro is Mavericks. Neither one of them can mount my USB sticks.
Thanks for your complete reply, you had some items that I did not try but unfortunately it did not help yet.

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The problematic system is a MacPro, running 10.5.6 (and Parallels 4 for WinXP).
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If I start Parallels with the thumb drive inserted. It asks me what I want to do with the device, and I can tell it to mount on the mac, and it does. If Parallels is already started, then I insert the thumb drive, nothing (Mac OS or Parallels) notices it was inserted.
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Roger
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I know that, but I have USB in my older Macs, too, and besides, some of the most knowledgeable people are in these older forums!!
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