@ownedbycats: are you sure there were 100+ pdftohtml processes as opposed to threads? I dont see how the indexer would launch so many. In fast mode, IIRC it uses num of cpus + 1 worker processes. That said pdf text extraction is not optimized currently, I need to find the time to use a dedicated tool like pdftotext for it which should be much more efficient. And yes you can always delete the temp dir after shutting down calibre (although it should be auto deleted).
@thiago: I dont see why the portable and installed version would behave differently. There is no code difference in them as far as handling icons is concerned. Try cleaning out your calibre config folder temporarily and seeing if that changes things.
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