It started off innocently. I only wanted to check a spelling. 'Queuing' or 'queueing'. My colleague's report said 'queueing'; MS Spellchecker (which, in Excel 97 comes only in American, for which queue is a foreign language) said queuing. I tried writing it down, but, to be honest, even 'queue' started to look odd (too many years of bus-catching in London?).
My Chambers Dictionary - which is rubbish, but I found it abandoned in a bookcase when we vacated our former premises - said that queue is 'a pendent braid of hair at the back of the head, a pigtail'. So I went to check out Mohammed's Collins. As I removed it from his shelf, I brought with me a pile of papers, just as he walked in the door - to see me destroying his work area. The Collins said queuing or queueing.
By this time I had disturbed the whole team, who all offered their opinion. Maggie's mini-Oxford does not contemplate queue as a gerund. So I'm going with the Collins but making note to self to buy proper dictionary.
Incidentally, when looking to see whether I really meant gerund, I encountered 'hebdomadal' - occurring every seven days.
So, weekly, then...