invalid database object reference

[survivo01]

I have spit database
Copys of FE on two computers
BE on shared file


Either computer can make changes, however if we try to open front end at same time on both computers the last one to open FE will get message invalid database object reference

I do not have the slightest idea what to do.
Windows XP patch 3
using ACCESS 2010 with file databse in 2007 format

[NTC]

hmmm....well; compact & repair the BE. then compact & repair FEs. and relink the FEs to BE......if you haven't already done this.

not sure it will help.....