Version 5.29 was never released. Version 5.30 fixes just one bug.
When TeXShop typesets a source file, it scrolls the pdf window of the new version to the spot visible in the preview window before typesetting. Consequently, the text shown after typesetting changes only slightly to show minor edits or new material added at the end. There are some exceptions. If the text starts with a table of contents covering several pages, and the aux file is deleted before typesetting, the output will jump several pages ahead after typesetting because the table of contents is missing and the document has fewer pages.A second typeset will restore the table of contents and return to the original spot.
If material is removed from a document before typesetting and the new document has fewer pages, it is possible that the visible rectangle in the original document is beyond the end of the document after typesetting. In version 4.28 and some earlier versions, TeXShop would then set the page number on the pdf toolbar to a large negative number. Moreover, in fit-to-window mode it could change the magnification of the page actually shown to 100 so the view no longer filled the window. These bugs are fixed.