I just recently updated to MacTeX 2015. With the 2014 version, I could type \cref, and TeXstudio would suggest a list of all labels used in the document, making cross-referencing easy. The same with BibLaTeX: the cite keys in the included bib file would be suggested, so that I easily could choose which source to cite while typing. Now I have to type the table/figure label manually, and look up the cite keys manually. This make writing much less efficient.
I am not sure if this is an issue with the MacTeX distribution, or with the TeXstudio editor.