same with us, on large plans we have never had the independent auditors question the change.
Looking further at the specific instructions I do not even see where it says you have to be consistent from year to year, simply you have to be consistent when filling out the specific parts. In other words, don't use accrued gains on some parts and not on others, or I'm going to use accrued match but the accrued profit sharing is not included this year 5500 instructions: Note. The cash, modified cash, or accrual basis may be used for recognition of transactions in Parts I and II, as long as you use one method consistently