Yes, Junk characters can cause database errors while opening company data.
If your company is not opening and showing error, you can follow these steps to resolve the issue:
Step 1: First take tha latest backup of your company.
Step 2: Go to Housekeeping menu and select the Reindex Databases option.
Step 3: Run the process and check the issue is resovle or not. If issue is not resolve, Remove the junk characters and Incomplete vouchers and try again.
Step 4: Run BUSY in administrator mode. Set compatibility, down UAC, change region setting UK and US, and give everyone rights to BUSY.
Step 5: Ensure you are using latest BUSY update. If not, Update your BUSY in latest version.
Step 6: If the issue persists, contact customer support for further assistance.
Note : Ensure you have latest backup before performing any housekeeping option in BUSY. and you have upgrade your BUSY in latest version. You should also take a daily backup to prevent any data loss.