So, here's my full list of bugs and feedback for improving Windows 10 Mobile starting from Build 10549 (I'm testing it on a Lumia 920)
Windows 10 Mobile Build 10549 - BUGS AND FEEDBACK LIST
UPGRADE NIGHTMARE:
- Only way to upgrade was to downgrade from 10536 to 8.1 Cyan via WDRT Desktop app, then upgrade 8.1 Cyan to Denim, then 8.1 Denim to 10549. It took literally HOURS, and it went wrong too;
- Upgrading from WP8.1->WP8.1/Denim->WP10549 goes wrong: apps were missing, wrong apps texts on App List, Internet Explorer instead of Edge, Settings and many apps won't open. The only workaround was to shut down the phone, and doing a further Hard Reset via Power and Volume keys. Then 10549 was finally installed correctly (another hour wasted);
- After reinstalling Windows Insider app, and re-enrolled to Fast Ring: another upgrade with "Fast configuration update" was triggered, so ANOTHER HOUR WASTED;
- PLEASE IMPROVE UPGRADE EXPERIENCE: Both from WP8.1 -> W10M, and from Old W10M build -> to new W10M. Always doing Hard Reset after an upgrade is NOT acceptable.
HARD RESET + NO BACKUP = PERSISTENT PROBLEMS:
- Some Store apps fail to update/install on first try (they gave an "Error"). I had to retry at least 5 times, and than they were updated/installed successfully;
- Settings pane crashes when trying to change Action Center triggers;
- New Messages app and Skype Video have bugged label on Settings->Phone and Settings->Messages (when selecting default text and video apps);
- Groove Music stops playing music when other media content is loaded in the player (like it should be)...but then can't be resumed from the same time/seconds returning to Groove app;
- Camera App: swipe from left to right to smoothly load Camera Roll photos is missing. A downgrade compared to stock 8.1 Camera App;
- Many animations are missing: for example opening Edge "Hubs" button, Edge "Tabs" button does not trigger any animation, and the next menu just appears like Windows 95. It happens many times with many OS menus, very ugly and a regression compared to WP8.1 smooth transitions;
- Action Center needs blur/transparency like Windows 10 Desktop;
- Edge ABSOLUTELY needs an AdBlocker or TPLs (Tracking Protection Lists) support. Both on Phone and PC. See new iOS9 Beta native ad-blocking features. It's night and day browsing after that;
- Edge doesn't have "Google" search engine option instead of Bing;
- Live Tiles sometime flickers and/or not update themselves;
- Swiping down the Action Center still has some lag/delay before it shows itself, at least the first time after boot;
- Calendar Live Tile doesn't update itself;
- Messages app is a bit slow to open;
- New Outlook app could be even faster to open;
- LinkedIn is no more integrated in People App.
- Performance is SO MUCH BETTER than 10536 on Lumia 920, I would say almost close to 8.1.2 . Very good improvements after all, but it could be even better (some "Loading/Resuming" screen still appears);
- Battery drain is still much worse than WP8.1. More Optimization needed.
A solid improvement from 10536 anyway.