A couple questions:
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You had no problems mounting the same exact devices prior to update?
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Did you make any changes to that storage (like changing disk format) on storage you are trying to mount?
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What is the process you use to attempt to mount the drives?
Immediately after attempting to mount the drive you are having problems with run:
sudo dmesg | tail -25
This should get us more detailed error messages to get clues on the error.
Then google that error and you should be able find resources to fix it.
If you continue having trouble share the last 25 lines from dmesg command segment here in a reply so everyone can see the details of the errors
(NOTE: if you do share, please keep log sharing to short 25 line segments (or less) to keep the forum clean).