WowAce

To reproduce with r144:

Have appropriate low-level pigment in bags;
Queue a glyph - it will correctly queue to manufacture ink and to buy parchment from vendor;
Open vendor and click "Vendor" in queue to buy parchment - the ink source changes to Vendor Conversion;
Right-clicking the ink in the queue and selecting another source from the dropdown menu does not change the source;
Only option appears to be to clear the queue and requeue the glyph.

Additional info (tested with r148):

The instructions I gave for reproducing this only apply for a low level character that has no access to Blackfallow Ink. Also you would expect GnomeWorks to inform you that you are missing a reagent, but there is no such warning.

For a higher level character (that is capable of making Blackfallow Ink) it doesn't happen: GnomeWorks initially selects Vendor Conversion but you can right-click this and change it to manufacture. Interacting with the vendor then doesn't change it again.

However I found a really odd thing with a recipe that has 2 reagents (e.g. Northrend Inscription Research).

• Initially GnomeWorks selects Vendor Conversion for both
• You can right-click one and change it to manufacture
• Trying to change the second reagent to manufacture doesn't work - it appears to get stuck on Vendor Conversion
• BUT when you buy parchment from the vendor, it then updates the second reagent to manufacture