Thanks very much for confirming!
I've done that - downloaded Electrum 3.03 on a different laptop and used my existing seed. It's connected but has been synchronizing for around 12 hours now (and still not finished). Is that amount of synchronisation time normal/expected?
I can see the blockchain_headers file being updated periodically during that time.
Thanks.
12 hours seems certainly strange and very very long and it might have been stuck during synchronization. It should barely take about 5-10 minutes to synchronize at max depending on the number of transactions you've made (I have transactions from back in 2014 and it seems to synch from scratch in about 3 minutes). This is because electrum is an SPV wallet which doesn't download the entire blockchain, but only the headers from an electrum server that it connects to. Here's few things you can do:
1) Exit and reopen electrum and wait for it to synchronize again.
2) If it doesn't synchronize within 5-10 minutes again, try switching servers and make sure the 'Use Proxy' and 'Use TOR proxy on 9050 port' settings are unchecked. Check my screenshots below from a demo / test wallet that I created and try the same after restarting electrum.