Hello!

The same problem in LOGO soft comfort 8.3.
The same solution "worked" - after removing the udf from library (red ? showed in UDF) the "Expand UDF" works. All seems OK, but for how long. My be there are some explanation and permanent solution?

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Split from UDF files become corrupt.

Good question! I really don't know. The UDF could not be loaded any more. Strange but LSC somehow worked - look at the print screen. If I manage to close the UDF all seems OK. The recovered UDF (Expanded without UDF in library) works and opens! I connect the recovered UDF to library and use in new application - still works.