Hey caramel - the issues with Cryptopia are on their side of things, its nothing to do with DimeCoin (if you go to any LTC or DOGE pairing of any coin you'll notice that they have the same warning message on all of them). Cryptopia is extremely backed up with support tickets at the moment, rest assured the DimeCoin team has reached out to them and is actively seeking a resolution to the problem.

To answer your question regarding withdrawal from Cryptopia, you can withdraw without worrying about your coins getting lost... however it might take a long time (a few days ago I heard someone say it took 12 days until their coins arrived in their wallet). On the other hand I've also heard people reporting that they have transferred their DimeCoins out and into the windows wallet which only took 2-3 hours for them.

Bottom line is no, you will not lose them... it just might take days for hte transfer to completely go through.