Like I supposed, operator error. I had that parameter to 0 (I really 
don't know why). Set to 1024 (I have 16G of RAM here) and it is working 
ok.

Thank you very much!

Romano

On 2014-08-21 10:41, Markus Jung wrote:
> Have a look at your darktable preferences, tab "core options" (second
> tab), option "memory in megabytes to use for mipmap cache".
> Change the value to at least 512
> 
> Regards,
> Markus
> 
> Am 21.08.2014 um 17:33 schrieb roman...@rgtti.com:
>> Ok,
>> 
>> this is probably an operator error (myself, I mean) --- let's see if
>> someone can point me to what I did the wrong way.
>> 
>> I installed a new PC with Ubuntu Gnome 14.04, and copied my image
>> collection here; I edit that one with darktable 1.4.2 before. Never 
>> used
>> (unless, again, operator error) any experimental version. After the
>> installation of darktable from  ppa:pmjdebruijn/darktable-release, I
>> went to the top of my tree and told DT to import recursively all the
>> photo. Now, I had some preset (for output especially) on the other DT; 
>> I
>> supposed that they would be ignored --- I do not mind.
>> 
>> Now I have a problem that I do not know how to solve. When I load 
>> again
>> some of the folders (in lighttable, import folder, choose) sometime 
>> the
>> folder come out with a lot of thumbnails flashing, as if DT were
>> re-rendering it all the time. ItÅ› difficult to explain; I have a
>> animated gif (the color artefact are for compression, please ignore)
>> here: https://dl.dropboxusercontent.com/u/57662186/out.gif
>> 
>> When behaving like that, I cannot export photos from the lighttable (I
>> can go into darkroom and export with Ctrl-e). I am really at a loss in
>> understanding what's happening here. Should I delete my library.db and
>> start again?
>> 
>> Romano
>> 
>> 
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> 
> 
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