Using Trend Micro antivirus software?
When using AccountEdge, the lock files are typically removed automatically when AccountEdge closes. However, Trend Micro antivirus software can sometimes prevent the automatic removal of the lock files. This means even if you manually remove the lock files (as described above), the issue will re-occur.
To fix this, you can set an exclusion in Trend Micro for your AccountEdge folder (the location where AccountEdge is installed - by default within the Applications folder).
Refer to your Trend Micro documentation for instructions on adding an exclusion to your AccountEdge folder.
Also see AccountEdge issues if using Trend Micro security software.