Initial Page Don't Appears

I am using MT v2.9r2 with hotspot mode.
I customed splash pages (login, alogin, status, logout), after each modification of these files I reboot Mikrotik, else appears this page:

Mikrotik HttpProxy

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Error: 504 Gateway Timeout

However, today when I connect to my hotspot MT in my house, this page appears again without any modification of files. I solve this problem rebooting MT.

What happened? How can I solve this problem definetively?

you should probably upgrade to the latest release candidate (RC5).

Edgars