Solution : https://service.sap.com/sap/support/notes/1047439 (SAP Service marketplace login required)
Key words :
terms copy paste move blank long urlsnw04s sp12 / sp11 / sp10 portal reason, copy & paste portal objects, move objects, blank screen, sp10 patch#7, sp11 patch#4, sp12 patch#2, editors/wizards aren', open editors, content area
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1052126 | SAP NW Portal Platform NW04s, SPs11 - Known Issues |
1052125 | SAP NW Portal Platform NW04s, SPs10 - Known Issues |
1042841 | SAP NetWeaver Portal Platform NW7.0, SPs13 |