1. 華府 is listed as rarely used kanji for ワシントン, however, a search in the vocab dictionary for 華府 returns no results. The same happens when clicking on 華府 in a sentence and trying to view it in the dictionary.
2. Previously, the sentences section of the dictionary could be used to search for English phrases or for English sentences containing more than one word by entering in multiple words with spaces in between. Now, that no longer works; instead, the only way to search multiple English words and get results is to enter them without spaces in between, like when searching with a Japanese search term.
For #2, previously it would work both ways. Like, if my search term was work today, I would get results with those words next to each other and results where they were separated by other words too. I believe it also was possible to use quote marks to limit results to ones where the words appeared next to each other. So it functioned like any other search engine would. Now I would only get results by searching worktoday, and the results would only include sentences where the words are next to each other. In other words, English searches now work just like the Japanese ones, which require there to be no spaces and only produce results where the words searched appear contiguously in the sentence.
Just noticed something else weird in the dictionary, it seems like for some words that have versions with alternate kanji, which entry appears on top, or what order the alternate kanji versions are listed in, is random. I was just looking up some words and in the process I searched for two separate terms multiple times; sometimes one version of the word would appear on top and sometimes the other would. Using the wildcard asterisk seems to increase the chance of it occurring. For example, a search for よく and for よく* often (though not always) produces differently ordered alternate entries. Doing a search for parts of もみじがり with an asterisk sometimes returns 紅葉狩り as the head entry, and sometimes紅葉狩.
I just searched "work today", and the below came up. It is most likely me not understanding something, but I do see results with the words next to each other, and with them separate. Can you let me know if these are the results that you get?
Also, there is not a "main" version of the linked words, so yes, it does vary depending on the search, especially if you search on kanji that only one of them has.