After recent upgrade of the reader highlighting or underlining works fine only with so to say high quality PDF files, e.g. directly derived from text documents. But with OCR scanned texts (by Adobe Acrobat PRO 11) marking does not function any more, so highlighting is inhibited.
No problems with annotating such PDFs on Windows PCs.
Hardware affected: Samsung Galaxy Note 10.1, Samsung Galaxy Note Edge S4
No idea about how to get back lost feature.
We are actively looking at the issue and will try to fix it in a future release. Could you please share your problematic pdf at firstname.lastname@example.org so that we can investigate the issue better?
Adobe Acrobat Team