If you are using a dual monitor or changing your monitor resolution, it is possible to ‘lose’ your Formula Editor.
For Version 12, close Crystal Reports first and then follow these steps:
Click the Start button and select “RUN”
Type “Regedit” and Click “OK”
Find the Registry key: HKEY_CURRENT_USERSoftwareBusiness ObjectsSuite 12.0 Crystal ReportsFormula Workshop
Change the “Editor Position” value to 10,10,10,10
Versions 9 – 11 have a slightly different registry key but they still require you to change the “Editor Position” value as shown above for version 12.
For version 11 use this registry key:
HKEY_CURRENT_USERSoftwareBusiness ObjectsSuite 11.0 Crystal ReportsFormula Workshop
For version 10 use this registry key:
HKEY_CURRENT_USERSoftwareCrystal Decisions10.0Crystal ReportsFormula Workshop
For version 9 use this registry key:
HKEY_CURRENT_USERSoftwareCrystal Decisions9.0Crystal ReportsFormula Workshop
Version 8.5 is completely different. Use this registry key:
HKEY_CURRENT_USERSoftwareSeagate SoftwareCrystal ReportsDialogs
Look for the property called FormulaEditDialogInit.
Source from http://kenhamady.com/cru/archives/845