I am quite prepared to believe that the "." matters BUT I'm sitting here watching sequences with files of that form load (Warp.0001.png specifically).
From what I can tell it appears to be required (for default settings).
The exact steps used in my particular importing case were:
RIght Click on a cell in the xsheet and select Load Level
Navigate to the Drive and Directory* containing the image sequence
Select the first image from the sequence (making sure it has the number 0001... in case that still matters).
The image sequence should load into the xsheet with each image in a cell from top to bottom.**
Note that it's important to only select the first file in the sequence unless you prefer other results.***
There are a lot of variables to contend with here and errors I've experienced before I'm not seeing now.
Is it possible this was fixed in a recent nightly build? I dunno. I didn't see those specific fixes mentioned in the release so I tend to think it relates to something changed on my end.
Something definitely has changed though because I'm getting different behavior (for the good though!)
I'm running the latest nightly build as of 5/26/16.
The important thing is that I'm NOT seeing crashes on loading image sequences in current nightly build and I'm actually TRYING to make them happen so that I can record them. :)
So consider installing the latest nightly build if you are experiencing problems and aren't using that.
*Placing image sequences with dots in them was problematic before IF the files were not in the root directory.
This appears to be no longer the case for reasons I cannot account for other than to guess a recent nightly build addressed the problem.
Note that for my purposes 'properly formatted' is of the form filename.0001.ext (actual filename at the start of my test sequence is Warp.0001.png).
Results from my testing:
The filename can be anything as long as there are no blank spaces
The dot between the filename and the number IS important. Failure to put it there results in only one image of the sequence being imported
The number should be four digits starting with 0001 and not 0000.
The .extention should be present
Note that we are suppose to be able to change/customize the file formatting via Preferences/Loading (using the code there) however most people do not do that and the Retas file formatting is used by default.
What is Retas file formatting? Apparently it is of the form .+[0-9]{4,4}\.tga where there is a dot separating 0a filename of 0 to 9 characters from four digits with a three letter image or video extension.
Added: Odds and ends regarding numbering of file sequences.
I just checked and drag/dropping Warp.0000.png into xsheet results in the entire sequence being loaded BUT without that first 0000 image in the sequence.
Missing frames from the sequence are replaced by a white image... which I believe unless otherwise defined is actually not white but transparent) Not sure about that though.
This is working every time I try via any way I try to get the image sequence into the program.
**Files that are not properly formatted will still import into the xsheet but into a new column rather than the same one.
OT apparently recognizes them as a new level rather than a sequence in the same level.
***In the current build dragging and dropping a selection of (properly formatted) files into the xsheet results in muliple columns of the exact same sequence being loaded.
This is why you only want to select the first file of the sequence.
Sorry for all the text guys.
I'm trying to move toward recording and sharing videos.
Note to Forum Admin: Perhaps these image sequence loading posts can be moved into their own topic.