only stock777 mention TWS version(after 7 pages)..
to OP and others-please, post your TWS,IB API and Java versions..i'm on old 875 for whole day and no problems so far..don't know about AH.
oops.. just checked on standalone 875.3 and 878.6 on 1.5.11 java and good old 8.6 API-same problem...typical for IB to do something like that...as i said before- there no QA dept...