If by "some issues" you mean it just seems to treat it as a search string instead of calculating the result, it seems to be happening in all browsers for me. Tried it in Chrome (on both Windows and Linux), Chromium (Open Source version of Chrome for Linux), Firefox, and IE (on both WinXP and Win7).
IOW it's a Bing bug, not a Chrome bug.
No idea why it still works in IE for you though. What version of IE was this? I used IE 8. Maybe the calculator feature only works in IE 9 now? That doesn't make much sense though, MS would have to be doing something really squirrelly for it to act like that.
(this space intentionally left blank)