Personally, I think an explanation is necessary - perhaps an apology? - there were a number of irate posts which indicated member's unhappiness....IMHO.
I agree that an explanation of what happened would be useful.
That being said, it has become common practice in the software industry that, each year, in Spring (April/May) and Fall (Sep/Oct), operating system suppliers (e.g. Microsoft, Apple, Ubuntu) release major/minor software updates (while urgent bug fixes and security patches arere leased in between) -- both for servers as well as for consumer devices. These major/minor software updates may have unintended consequences and/or reveal problems and/or dependencies in application software (both on servers and end user devices) that third-party suppliers (e.g. for databases, BB software on the server and/or browser, antivirus and spam-blocker software on end-user devices) need to catch up with. Then, service providers (like the organization running AlfaBB) have to catch up with problems that relate to either the software they rely upon, and then figure out if problems depend on their specific combination and configuration of the server environment, and/or whether or not the problems happen on end-user devices and manifest themselves in context of accessing their servers.
I spent time on all four sides of this fence (end-user, integrator/service provider, end-user software supplier, and server software supplier). It is not an easy world to live in. It's not necessarily that someone screwed up -- most often, it;s just a matter of increasing complexity that may be further complicated by the fact that certain problems only appear at scale (high volume number of users, and/or high volume activity, and/or with cumulative uptime).
Sometimes, it takes a while to figure out what the problem pattern is (e.g. including end users on old, outdated platforms (Windows XP/Vista/7 with IE, iPhone 4, old iPads, etc.) no longer being able to access the site). Then, there are the problems introduced by evolving technology: I believe the average consumer has no idea how complicated live became for web-based services that need to operate on desktop platforms (with mouse) vs. touch pads on phones and tablets (often with proprietary software intended for creating silos), and detect and deliver content to various screen resolutions that dynamically may change, at the whim of a user, from Portrait to Landscape modes, and then adjust presentation of screen content and navigation controls accordingly. (On that note, I believe the next big waves of change at our door steps is that navigation will be extended to voice commands and eye tracking -- which will be a fun ride for IT services at all levels).
My suggestion is (no matter what platform you are on, and/or what services you may use): Brace yourself for problems in Spring (April/May) and Fall (Sep/Oct) each year. And, have some compassion and understanding for how hard it is to keep systems running, and what a great job large companies did and do that we have come to expect it to always be there, and always work the way we expect -- even if we, the end users, don't really know what we like before we see it.