If you got bugged during the server issues, you may still be bugged. There is a work around which involves replacing a non cargo item such as Basic Scanner or Fuel scoop with a cargo rack, then buying and selling a single item which supposedly resets you and allows trading normally. Then you sell the new cargo rack and rebuy your old item, going on as usual.
If you have no non cargo rack items to sell and replace with a new cargo rack, then people have suggested exploding will reset you, but this is extreme of course.
If you were not playing last night and didn't get bugged, you shouldn't be affected in any way, since the servers seem to be working correctly again.
This info is just from personal experience and reading the forums though, so proceed with caution. I'd buy a single cheap commodity and try to sell that before investing in 200 tons of Palladium for example.