Hi @a r
Are you trying to populate the SPSS Statistics Data Editor by copying and pasting from some other application? Does the problme go away when you copy/paste smaller blocks of text/data?
Copying to the OS clipboard and pasting into an application can be a very inefficient and potentially destructive thing to do. Where is your data originally? Is it possible for you to identify a common file type that both your application and IBM SPSS Statistics can read and write.
Give the "File -> Open -> Data " (for native formats SPSS Statistics can read) a try:
Or try the Text Import Wizard: