I've just gone to update some stats, it's been a while, and a bunch of values are at 0. I am using custom indicators to reference the VWAP & VWAP deviation values at the end of the session. I accomplish this by using MPD with 1 minute intervals on a daily chart. The MPD uses a custom indicator

REF(VWAPL,POS+1) with VWAPL representing one of the VWAP values I want to reference, and POS set to 'Bars from start of the session'. This has worked fine in the past, is there any reason this isn't working anymore? Is there a better way I should be going about this?

Thanks