Blockchain problem - need help

[dpb53]

I've been mining monero for a couple years with no major problems, but I got this error a few days ago:

ERROR /DISTRIBUTION-BUILD/src/cryptonote_core/blockchain.cpp:3401 WARNING: local blockchain failed to pass a MoneroPulse checkpoint, and you could be on a fork. You should either sync up from scratch, OR download a fresh blockchain bootstrap, OR enable checkpoint enforcing with the --enforce-dns-checkpointing command-line option

so I synced from scratch (took 2 days) and today got the same error at the same point in the sync:

2017-Apr-18 13:23:23.433588 ERROR /DISTRIBUTION-BUILD/src/cryptonote_core/checkpoints.cpp:106 CHECKPOINT FAILED FOR HEIGHT 1288616. EXPECTED HASH: <875ac1bc7aa6c5eedc5410abb9c694034f9e7f79dce4c60698baf37009cb6365>, FETCHED HASH: <1e6b1019968d4a33b281ab70d83947bc051ac952f26dd2693c427b04d82151fe>
2017-Apr-18 13:23:23.433803 ERROR /DISTRIBUTION-BUILD/src/cryptonote_core/blockchain.cpp:3401 WARNING: local blockchain failed to pass a MoneroPulse checkpoint, and you could be on a fork. You should either sync up from scratch, OR download a fresh blockchain bootstrap, OR enable checkpoint enforcing with the --enforce-dns-checkpointing command-line option

The main problem for me is that monerod is running and has been stuck at block 1288638 for more than 24 hours. I'm running 0.10.3.1

What do I do to fix this?

[sxafir]

Create own blockexplorer or Monero have fork.

[dpb53]

I'm sorry. I don't understand your reply.

[sara8877]

I got the exact same error, same expected hash, same fetched hash:

2017-Apr-20 22:06:56.709126 [P2P9]ERROR C:/msys64/DISTRIBUTION-BUILD/src/cryptonote_core/checkpoints.cpp:106 CHECKPOINT FAILED FOR HEIGHT 1288616. EXPECTED HASH: <875ac1bc7aa6c5eedc5410abb9c694034f9e7f79dce4c60698baf37009cb6365>, FETCHED HASH: <1e6b1019968d4a33b281ab70d83947bc051ac952f26dd2693c427b04d82151fe>

2017-Apr-20 22:06:56.709712 [P2P9]ERROR C:/msys64/DISTRIBUTION-BUILD/src/cryptonote_core/blockchain.cpp:3402 WARNING: local blockchain failed to pass a MoneroPulse checkpoint, and you could be on a fork. You should either sync up from scratch, OR download a fresh blockchain bootstrap, OR enable checkpoint enforcing with the --enforce-dns-checkpointing command-line option

I'm new to monero, last week I started with the CLI wallet, after 24hrs, I had to completely restart the sync.  After that, I downloaded the raw blockchain and started syncing again ( fast mode).  It took forever again, so I installed the GUI wallet.  
It has been syncing for 5 or 6 days now, and it seems it failed again (just saw this error in the log).

Is it always such a pain to create or install a wallet?  Is there a simple way to check the balance on the wallet I have?

[dpb53]

I was able to fix the problem. It took a lot of care to eliminate *every* file that referred to the old blockchain download. Apparently my download had forked. Since I use linux, it was stored in a file in my .bitcoin directory. I hadn't erased everything before, when I tried to re-sync, so it encountered the fork again. So I erased the .bitcoin directory as well as the entire software download (except my wallet, which had my coins, of course, and all the files related to the wallet.)

Then I downloaded everything from scratch and re-synced and it works fine now.

I hope this helps.

(Changed the subject to include XMR)