We're aware of continuing problems accessing Google Drive in Construct. We are very sorry for the inconvenience and we're working with Google to resolve the problem as quickly as possible. Updates are being posted in this forum thread. In the mean time you can continue to access your project files via the Google Drive web interface at drive.google.com. In order to try to help mitigate the problem this release also adds a notification about the problem when you select the Google Drive cloud save service, including advising to use the Google Drive web interface. When the problem is resolved, we will release another update that removes this message.
Separately, this release also includes fixes for two issues that may have affected existing projects when exporting to iOS, or using SVG picture.
In case you missed it, you can view the original r234 release notes here.