Custom indicators not displaying in different timeframes

 

I have recently noticed a change in several of my custom indicators - when I change the timeframe on the chart, all the indicator buffers empty out, and remain empty even when the chart is switched back to the original timeframe.

Oddly the only way to change the timeframe now seems to be to remove the indicator in question, change the timeframe and then re-apply the indicator.  This is pretty tedious and hasn't always been the case for these indicators, has anyone else come across this problem and do you have any suggestions for dealing with it?


Thanks in advance guys.