Background: Some time ago (two weeks or so) I sent a small amount first (to test the Factom wallet) to polo. Worked well, so I transacted more. But the deposit didn't even show up. I opened a ticket but got no response for 12 days.
Then I wanted to know what the problem is and sent another 1 FCT or something like that (maybe less). And surprisingly my previous bigger deposit showed up and was confirmed. But: The 1 FCT was stuck now ;-) I've done that again, at least 3 times. A deposit is stuck and I send a small amount to "free" it and it worked.
My last deposits went well but something is not right. I doubt it's a Factom-problem because I never had that problem with Bittrex.
Maybe try it - but only a small amount of course.
Deposits didn't show up on my account or were displayed as unconfirmed (stuck on 1/3 for example) while confirmed on the Blockchain.