I try to import two subtitle streams into a track (normal and director's comments). Sub streams are ripped with Subripper.

Importing each of them separately is fine. However, if I try to import both, the second stream is rejected and the error message shown is "The timecode is overlapping". This error is displayed for almost every subpicture in the stream.

An example (part) of the error list is shown below:
Error The timecode is overlapping. [01:51:37;17 - 01:51:40;23]
Error The timecode is overlapping. [01:51:41;08 - 01:51:46;00]
Error The timecode is overlapping. [01:51:46;12 - 01:51:51;11]
Error The timecode is overlapping. [01:51:51;22 - 01:51:57;01]

I can't understand what's wrong with it. looking at the script file, there appears to be no overlap in the sequence. As each script is accepted by itself, it appears that the overlapping refers to overlapping between the two streams. But these should overlap - be displayed at the same time codes - since only one stream is available at one time.

Am I missing something ? Insight greately appreciated.