Hi Carlbe and welcome.
Did your blended lines have pressure profiles applied to them, or have you been moulding pressure profiled lines before drawing your blended lines? As that can cause something like this to happen. It's a bug in the mould tool.
For example: Moulding a filled object with a pressure profiled outline, will delete the fill (or blend in the case of your lines) and leave you with just an outline. On converting the mould to editable shapes the resulting 'line' is actually a grouped shape or sometimes shapes.
I'm not sure if this is causing your problem but it sounds like a similar sort of thing. Even if your blended lines do not have any pressure profiles themselves, it can still happen; because after moulding any pressure profiled line, the mould tool will then treat any new objects in the same way as above, even if they have normal lines (Constant) or no lines at all.
To get out of this 'mouldbug' mode try saving, closing and reopening the file. Then see if your moulded blends have returned to normal. If so and even if they have no pressure profiles themselves, you can still have problems with them if you try to move them in the page (Xara X seems to remember and the blends may revert back to outlines).
If this is what is happening in your file, and on reopening the blends have reappeared inside the mould as normal, you could straight away convert the whole mould to editable shapes (Ctrl+Shift+S) to preserve your blends.
However, if you don't want to do this to the whole thing, you could: remove the mould, select your blended line objects and convert them to editable shapes (don't worry about ungrouping). In the arrange menu then select 'Convert Line to Shape', this creates a new shape for each line and you should now be able to mould everything as normal.
As a last resort if any of this doesn't work you may need to redraw your lines and re-blend etc after reopening your file.
Regards
Su
"If there was anything that depressed him more than his own cynicism, it was that quite often it still wasn't as cynical as real life." - Terry Pratchett, Guards! Guards!
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