DMSO can solidify in cool temps including air conditioning if it's right under a vent.
I don't think it would have damaged the column but you probably need to talk to the column manufacturer about it for sure. Getting DMSO back to a liquid state can take a while even at higher temp. The column is likely to take a LOT longer to get everything back into a liquid state than it would take just for a solution on the benchtop because of the pores.
Ultimately I think you need to call the column supplier because they'll be in the best position to recommend what to do with their column.