3 users (10% of users) experience disappearing plp file every 2 or 3 days. Sometimes it occurs when locking machine when attending meeting. On return to workstation they unlock machine and it is really slow and plp file is missing (can see it on server or if unmap drive on workstation and remap). Although remap drive is a workaround the workstation is still slow so 3 users end up rebooting anyway. HP xw4600 Workstation Intel Core 2 Quad CPU Q6600 2.40GHz 1.58GHz, 4GB Ram, XP Pro SP3.