Just tried launching 3 times and this is the text from launcher log:
[5:28:55 2015-11-13] Patcher: Patcher Version Number: “1.2.3”.
[5:28:58 2015-11-13] Patcher: Local download path set to "C:\Users\Craig.REQUEST-IT.000\Downloads\Zwift".
[5:29:01 2015-11-13] Patcher: Server URL path set to “http://cdn.zwift.com/gameassets/Zwift_Updates_Root/”.
[5:29:05 2015-11-13] Patcher: Local update path set to “”.
[5:29:12 2015-11-13] Patcher: Kicking download of “Zwift_ver_cur.xml”…
[5:29:14 2015-11-13] Patcher: Kicking download of “Launcher_ver_cur.xml”…
[5:29:16 2015-11-13] Downloader: “Zwift_ver_cur.xml” downloaded successfully (manifest checksum not provided, i.e. -1).
[5:29:19 2015-11-13] Downloader: “Launcher_ver_cur.xml” downloaded successfully (manifest checksum not provided, i.e. -1).
[5:29:22 2015-11-13] Patcher: Completed downloading server XML version files (Game & Launcher).
[5:29:24 2015-11-13] Patcher: Fetching version attribute from file: “Zwift_ver_cur.xml”
[5:29:26 2015-11-13] Patcher: Local version is “1.0.8454”.
[5:29:28 2015-11-13] Patcher: Server version is “1.0.8454”.
[5:29:29 2015-11-13] Patcher: Local manifest is “Zwift_1.0.8454_manifest.xml”.
[5:29:30 2015-11-13] Patcher: Server manifest is “Zwift_1.0.8454_manifest.xml”.
[5:29:32 2015-11-13] Patcher: Server manifest file checksum is “-2091252801”.
[5:29:33 2015-11-13] Patcher: Server ver_cur checksum is “-944182303”.
[5:29:34 2015-11-13] Patcher: Local Launcher version is “0.0.0”.
[5:29:34 2015-11-13] Patcher: Server Launcher version is “0.0.0”.
[5:29:35 2015-11-13] Patcher: Launcher URL for updating self is “www.zwift.com”.
[5:29:36 2015-11-13] Patcher: No update available, deleting temp files…
The “Whoops” page is an HTML page from the ZWIFT server.
Shut down the launcher, and it starts first pop with this in the launcher:
[5:46:46 2015-11-13] Launcher: Launcher Version Number 1.0.11
[5:46:46 2015-11-13] Launcher: Starting DxDiag
[5:46:46 2015-11-13] Launcher: Checking for 64-bit OS
[5:46:46 2015-11-13] Launcher: Initializing UI Components
[5:46:50 2015-11-13] Launcher: Initializing Tray Components
[5:46:50 2015-11-13] Launcher: Initializing Patcher
[5:46:51 2015-11-13] Launcher: Setting Login URL
[5:46:52 2015-11-13] Launcher: Navigating to Login URL
[5:46:53 2015-11-13] Launcher: Checking for VerCur Override
[5:46:53 2015-11-13] Launcher: Displaying Main Window
[5:46:58 2015-11-13] Launcher: Checking for Internet Connection
[5:46:58 2015-11-13] Launcher: Patcher Update Process Check
[5:46:58 2015-11-13] Patcher: Patcher Version Number: “1.2.3”.
[5:46:58 2015-11-13] Patcher: Local download path set to "C:\Users\Craig.REQUEST-IT.000\Downloads\Zwift".
[5:46:58 2015-11-13] Patcher: Server URL path set to “http://cdn.zwift.com/gameassets/Zwift_Updates_Root/”.
[5:46:58 2015-11-13] Patcher: Local update path set to “”.
[5:46:58 2015-11-13] Patcher: Kicking download of “Zwift_ver_cur.xml”…
[5:46:58 2015-11-13] Patcher: Kicking download of “Launcher_ver_cur.xml”…
[5:46:58 2015-11-13] Downloader: “Zwift_ver_cur.xml” downloaded successfully (manifest checksum not provided, i.e. -1).
[5:46:58 2015-11-13] Downloader: “Launcher_ver_cur.xml” downloaded successfully (manifest checksum not provided, i.e. -1).
[5:46:58 2015-11-13] Patcher: Completed downloading server XML version files (Game & Launcher).
[5:46:58 2015-11-13] Patcher: Fetching version attribute from file: “Zwift_ver_cur.xml”
[5:46:59 2015-11-13] Patcher: Local version is “1.0.8454”.
[5:46:59 2015-11-13] Patcher: Server version is “1.0.8454”.
[5:46:59 2015-11-13] Patcher: Local manifest is “Zwift_1.0.8454_manifest.xml”.
[5:46:59 2015-11-13] Patcher: Server manifest is “Zwift_1.0.8454_manifest.xml”.
[5:46:59 2015-11-13] Patcher: Server manifest file checksum is “-2091252801”.
[5:46:59 2015-11-13] Patcher: Server ver_cur checksum is “-944182303”.
[5:46:59 2015-11-13] Patcher: Local Launcher version is “0.0.0”.
[5:46:59 2015-11-13] Patcher: Server Launcher version is “0.0.0”.
[5:46:59 2015-11-13] Patcher: Launcher URL for updating self is “www.zwift.com”.
[5:46:59 2015-11-13] Patcher: No update available, deleting temp files…
[5:46:59 2015-11-13] Launcher: Launcher Update Process Check
[5:46:59 2015-11-13] Launcher: Checking for Game Update Availability
[5:46:59 2015-11-13] Launcher: Game Update Not Found
[5:46:59 2015-11-13] Patcher: Parsing local “Zwift_1.0.8454_manifest.xml”…
[5:46:59 2015-11-13] Patcher: Iterating “Zwift_1.0.8454_manifest.xml” to verify local files…
[5:47:47 2015-11-13] Patcher: Parsing local “Zwift_1.0.8454_manifest.xml”…
[5:47:47 2015-11-13] Patcher: Iterating “Zwift_1.0.8454_manifest.xml” to verify local files…