I have a strange behavior in ver. 220.127.116.11 with atributes and grouped products.
Steps to reproduce:
Choose a single product which is part of GROUPED PRODUCT.
Change desired attribute value (it's a custom attribute made by us).
See shop Frontend
RESULT: Changes in layered navigation in Frontend not visible. I stil see the old attribute value.
Then I have to manually re-index the "PRODUCT ATTRIBUTES" index in SYSTEM -> INDEX MANAGEMENT.
After manual re-index I see the changes in Frontend. All indexes mode are set to "UPDATE on SAVE", like this:
Please note that this affect only grouped products. Not single one. On configurabile i didn't test.
Can someone please explain me or point me in the direction to solve this issue. I suppose that after save attributes should change in frontend?