Just a little hotfix being applied to your game today. We've updated the Season's and Wonders update with a few little additions.
The changes going into this hotfix are;
-Invalid technology is no longer specified as an objective target for Carthage in Hannibal at the Gates Campaign.
-Syracuse research rate faction trait bonus now confers the correct effect.
-Fixed lighting bugs with trees in Autumn on the battle field.
-Improved season effect bundles in main campaign, and fixed a few issues with the effect bundles.
-When facing attackers with superior missile strength, the defending AI’s decision-making regarding sally-outs from un-walled settlements and encampments has been improved.
-Enabled civil wars for Arevaci, Lusitani and Syracuse factions in Grand Campaign mode.
-Loading screens are now visible to viewers while broadcasting with Twitch.TV.
-Updated base region religions of Iberian regions.
You can also see them in the Season and Wonders Patch notes at the bottom of the page.
Link to patch notes: http://wiki.totalwar.com/w/Total_War...Wonders_Update