Without much information, i only could suggest :
1. Re-install or update (Newest version is 3.1.3 BTW) your Electrum wallet, there's chance the application corrupted.
2. Check if another application working properly. If other application don't work properly, try to reinstall/repair your OS since important system files might be missing or corrupted.
Also, check whether your network status (in Electrum).
Thank you very much for all your advice.
Please confirm that this is how I should update:
1) go to electrum.org
2) download the latest file for OSX
3) run the dmg file
4) a popup opens with the electrum logo in it
5) drag the electrum logo into the Apps folder over the existing version I have installed
I think that this is what I did last time and everything was updated and all my wallets were accessible properly without having to restore anything from the seed.
Thanks
I have never used a mac, but using this procedure will only work if the wallet file isn't corrupted. If you want to be 100% sure, just run a standalone version on a clean pc and restore from seed....
The procedure you describe might work if the newer version solves a bug that lead to the strange behaviour on your side, but if it isn't a software bug but rather an OS/network/wallet related problem, just updating your existing wallet might not do the trick.
Do you own ANY other device other than the device on which your wallet is giving your troubles? There are binaries available for linux, windows, osx and android.