{solved} Why do I lose the + icon on categories with subs in Categories block?

[nadiap]

As subject lines says - everytime I add a new category or a sub category, I always end up losing the + sign on the root category link in the Categories block in the left column. Even after clearing cache (both shop & browser), the new additions show up, but still won't bring back the + icon.... do I have to 'reset' the categories block everytime I add a new item ?? Haven't reset as yet as I don't want to lose all my work to date ???

Edited January 19, 2013 by nadiap (see edit history)

[nadiap]

Yep, had to 'reset' the categories block to bring back the + showing the subcategories - but this then repositioned the block to where I wanted it.. so then had to use the Position> Live Edit to reposition the categories block to the top of the column as my preference... bit of a PITA really having to go through these steps every time I decide to add another category with sub-categories