>>I would move the project somewhere else and then create another project with the same name. Place the start program in it and start adding the project elements again. If you move the current project somewhere else or rename it you could use it to know what was in the project that has to be added back to the new one. I have come across that error in the past and what I ended up doing was restoring from a back up and then readding the items I added since the backup. The project became clean again and I moved on. Sorry I could not help with a specific answer.
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>Just to let you know, I took your advice and created a new project. That fixed it, so I'm off and running again.
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>Thanks again

Glad to help, I invested in Microsoft Plus 95 and the scheduler zips all of my project files every day of the week to a backup file (Mon.zip, Tue.zip, etc..) and restoring out of that has saved my bacon several times.