problems converting Excel to PDF

before august, able convert excel (office 2007) document multiple worksheets pdf file had tabs @ bottom view different worksheets.

now (all of sudden) pdf created 1 file of worksheets stacked 1 after other in document no tabs.

such if first worksheet has 1100 pages , second had 30 pages @ page 1101 find second worksheet.

or prompts create multiple pdf documents (one document each tab (worksheet)).

appreciate recommendations can find no searching internet.

acrobat version # , updates?

also, office 2007 should have "save option" (file >> save as) save excel file pdf file. if don't have option need download add-on microsoft website:

Rest