You should also check the cell voltages with a seperate voltage tester, it's possible that the charger is reading the voltages incorrectly, if it is then it will probably need replacing.
Otherwise it sounds like the LiPo is well out of balance and that the charger is starting the balance process very early - ie one cell is at 3.7V but the other cell is only at 3.6V and will need a LOT of balancing to sort out.
I had this with a pack that had been over-discharged, after a few attempts at a charge and discharge I just could not get the voltages to balance and the pack was only fit for recycling.
You can try leaving the charger attached but it may take a LONG time for the cells to balance at 0.1A. Perhaps never. Or you can try a balanced discharge to 3V per cell, and then try charging again. If that still doesn't work, the pack may well be dead.
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