Had 2 of my 4 wires returned to MtGox today, minus about $70 per wire due to fees.
Called Citibank and asked for a trace on the wire and reason for refusal (as I have wired from MtGox to this account before I know for a fact all info is correct). Citi could not find any trace of the wires coming in and/or being refused, they also directed me to Mt Gox and Mizuho to find out reasons for return.
Contact MtGox several times, they always answered me within 24h but after one week and several emails they still refuse to show me the proof of the wires from Mizuho and keep telling me all wires were executed and refused by Citibank.
I am annoyed at the fact that I am losing $70 on 5 separate wires ($350) for a problem originating from MtGox - I understand paying fees if I had entered the information incorrectly but paying them because of MtGox internal problems with their banks or authorities is not acceptable, they should cover those fees IMHO.