Using Chrome, I discovered the following issue in my own application and was able to reproduce it in the showcase.
1. Go to the showcase (http://www.smartclient.com/smartgwt/showcase/#main)
2. Select the Simplicity style
3. Open the Tabs > Orientation example. Notice that the font is different on the tab title. Using the Chrome inspector you can see that the new tab is using the style tabbuttonleft while the first tab is (correctly) using the style tabbuttontop.
Also, any future tabs will now use the tabbuttonleft style instead of the the tabbuttontop style (sometimes, not always).
1. Go to the showcase (http://www.smartclient.com/smartgwt/showcase/#main)
2. Select the Simplicity style
3. Open the Tabs > Orientation example. Notice that the font is different on the tab title. Using the Chrome inspector you can see that the new tab is using the style tabbuttonleft while the first tab is (correctly) using the style tabbuttontop.
Also, any future tabs will now use the tabbuttonleft style instead of the the tabbuttontop style (sometimes, not always).