Mine "looked" sealed, too... Turns out one of the screws wasn't in tight and over time it vibrated enough to pull the sealant up from the surface enough to allow water under the sealant and down the screw hole; slow drip onto the toilet seat. The drip was fully enclosed in the fan assembly, so, there wasn't any structural effects. I peeled the existing sealant off, cleaned it up and re-sealed and cured the issue.
Though yours looks sealed, you may have the same problem...
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My 2 cents, your mileage may vary...
Don
Bronwyn
2 Cats; J-Lo and Ragamuffin :R
2014 Thor Tuscany 40RX DP
2011 Ram 2500 Longhorn CTD HO
2011 Keystone Cougar 318SAB (now gone)
2008 FunFinder X 210WBS (Sadly gone)
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