Siena 0.9.13. Thumbnails in the folder datas/thumbs/ are not created for big images. The big image is uploaded successfully but the thumdnail-copy of it isn't created on my site automatically. (example - .jpg - dimensions = 3264x2448 px; File size = 1,95 Mb, permissions for big files upload were set). Please check it. I hope this situation happens only by me, but still I think it is better to report.
Sorry for my bad english and thank you very much for this greate CMF ;)