Numbers gives syntax error for all equations
I'm not sure what is going on but I keep getting syntax errors for multiple equations and it doesn't matter where i put it or how, it still gives the syntax error. Example B2 has 500 in it. On B3 I enter B2x2 and it gives a syntax error instead of 1000. I've quit numbers and re-opened the file with same results. I've even opened a new spreadsheet and when entering nothing except those entries, I still get the syntax error. It seems there is something wrong with numbers itself. Can anyone explain why I can't use formulas at all. They used to work in the past so I'm confused what may have happened.
iMac, OS X Yosemite (10.10), null