New Page – cannot Preview nor Save Data

i have been using WP now for about 9 or 10 months, and everything has been running just fine.

my website, https://www.automaton.jp , is japanese webpage for my american customer. i update whatever he does, but in japanese.

the problem; i decided to add a “deck history page” and the first time around everything was fine – no problems. nothing.

however, today, i began to finish off the section by adding the last few deck pics and explanations. then i went to preview, and nothing came up – just a blank page with a link to “edit this entry”.

i then decided to save the data, go back to the Dashboard, and then back to the Pages section. when i went back none of my data was there even though i had saved it.

i tried saving all the html data, deleting the page and then starting from scratch, but the same problem still arises. what gives?

i am not a very computer savvy person, so, i apologize if my description is too vague. moreover, i don’t always understand IT/computer/website jargon, but i will do my very best.

any and all feedback, opinions, insights, inferences, etc. will be greatly appreciated.

Thank you!