[SOLVED] Relation (List of related items) stopped working

hi there,

my "Relation (List of related items)" - field does not work anymore:

[problems]
1) the feature SCOPES > "Include subcategories" seems to have lost its function: the list "Available item(s)" is empty.
2.a) "Available item(s)"-list is populated, however, for a splitsecond only, if I point to the direct subcategories instead of the main category 'products'.
2.b) After the splitsecond, the list is empty again: the <select> 's <option>s are gone from the DOM.
2.c) This splitsecond of success does not happen, as soon as I include any "higher" category in the scope.
2.d) This problem happens equally during both create and edit

[details]
my field is configured like this:

SCOPES > By Category >
Categories = "products" (the items are organised in product's sub-categories, and this system has not changed)
Method = Include
Include subcategories = Yes

SCOPES > By Type > All

SCOPES > Other Scope Limits >
only limit is 'item owner'. (this did work fine until now.)

Is there any quick fix you can provide me with?

[setup]
FC 3.0.13

Hello

is it happening in backend or in frontend only ?

- you may send me a PM with access and an item id to edit for testing

Thanks for the offer. Actually, preparing your PM made me fix it!
(We did have a small script running that selected one of the options in the category-select2, and then hid it! *facepalm* that was an earlier client wish...) Sorry for bothering