we are always getting "There is A Slight Problem" dialog box without any error mesage inside it whenever we are updating the Custom Forms.
I have encountered this error most of the times when I was using the "recalculate" tickbox on a calculated field and my assumption is that what we are seeing here might indeed either be an access conflict (e.g. someone else doing stuff in the task / project and saving) or that the operation simply times out, especially when the recalculation affects a large data set. I encounter this error not as often in my early morning hours, when EMEA and NASA are not active. So - and this is important - I can almost reproduce this a 100% when recalculating calculated fields when EMEA is awake and working and the frequency is much lower in my 6am - 9am hours when APAC is almost out and EMEA has not woken up yet.
So it appears like an access conflict or a timeout on the recalculation over large data sets are the most likely causes. But in order to sort that out, we need the error message to be more detailed.
If it is a resource conflict, I would say that the recalculation should simply wait for the resource lock to lift and then update the task. If it is indeed a timeout then I would say that the recalculations should just run in batch and be non-blocking for the UI so that the updates happen in the background.
"We need better logs and Intelligent error messages to really nail it down"