HotPixels show up after several LR processing steps

Question

Dear all,
I am having two problems with Nikon Raw Processing and LR4.1.
1st: I am producing and processing content for ESO (European South Observatory), especially TimeLapses. Those sequences consist of hundreds of Images in hundreds of folders. Source files are either from D3s, D4, D700, D7000 or the like.
Several development changes are applied to single key images in a sequence, and those later applied to all images in that sequence. Problem is that after a certain amount of development changes (that are written in to the XMP sidecar files with LR4), hot pixels start to show up in the images that were not visible before.
Seems like the oversaturated pixel information (Hot Pixel) that is always stored within the RAW images, is lost after a certain amount of development changes.
2nd: is there a known trick how to force LR4 into updating ALL thumbnails after development changes, including those, that are outside the currently visible grid view?
It is very time consuming to manually page up and down the grid to have LR4 updating the thumbnails on each page (of for example a folder of 1200 images) so that one gets a preview of the TL sequence with the current development changes in Library View.
Thanks for any help
Chris

Answer 1

Hi Trshaner,
yes, to all your suggestions. Tried them alreadym and it's in our workflow.
With Astro-TimeLapse and/or panning motions it is even more complex. You immediately see the static hot pixels during a timelapse motion on a moving landscape.
First you cannot use the adjustment brush on stars - it looks odd when they move trough and brush areas fill and empty with other stars during the Timelapse Motion. Second once you pan or have a dolly movement some brush areas "move" trough trees or other parts of the landscape. it looks very ugly. what you can do is to stop brushing the hot pixels there for the the couple of images, or do all by hand means adjusting the healing brush location outside the tree or other part of the landscape moving by.
enclosed are some screenshots with brushed hot pixels, and the start of a pan and the end - the timelapse motion in this instance goes over 344 frames (not that much, but enough to work on for a couple hours).
remains my question:
I don't see those hot pixels during the first processing steps which are all synced over all images of a set (lighten darks, color correction, gradation curve etc). at some point during processing and developing they start to show up. And I can't remember that this was the case with LR3.
any idea on how to force LR4 to update ALL previews also those outside the grid are still very appreciated.
this here illustrates my problem:
(watch it until the end how it should look like on preview)
https://vimeo.com/43257787
pw: starry_lr4
it got a bit better now with a current MBP 15" 2.6 Ghz Core i7 and SSD's and Mountain Lion (Lion was quite slower), but still previews outside the grid do not get updated...
all the best
c
illustration:
begin of panoramic timelapse move
somewhere in the middle
near the end
hot pixel detail of last frame without heal brush