Hello Gentry,
* I am a Microsoft user like you, providing solutions to community members; I am NOT a Microsoft employee.
It sounds like there might be a conflict with a macro assigned to the CTRL+PGUP shortcut in Excel 2013. Here are a couple of solutions you can try:
- Clear Assigned Macros:
Press Alt + F11 to open the Visual Basic Editor (VBE).
In the VBE project window, navigate to the VBAProject containing your workbook.
Go to the "Insert" menu and select "Module." (This creates a new module if one doesn't exist)
In the module code window, paste the following lines and press Enter:
Application.OnKey "^^{PGUP}", "" ' Clear Ctrl+PgUp assignment
Application.OnKey "^^{PGDN}", "" ' Clear Ctrl+PgDn assignment (optional, for completeness)
Close the VBE (using the "X" button in the top right corner) and return to Excel.
Try using CTRL+PGUP again. It should now switch worksheets as intended.
- Disable Add-Ins (if applicable):
In some cases, add-ins can interfere with keyboard shortcuts. Try temporarily disabling your Excel add-ins to see if it resolves the issue:
Go to "File" > "Options" > "Add-Ins."
In the "Manage" dropdown, select "COM Add-Ins" and click "Go."
Uncheck any add-ins that are listed and click "OK."
Restart Excel and see if CTRL+PGUP functions normally.
If it does, you can re-enable your add-ins one by one to identify the culprit.
Hope this helps.