Index: branches/5.1.x/core/install/upgrades.sql
===================================================================
diff -u -N -r14241 -r14265
--- branches/5.1.x/core/install/upgrades.sql	(.../upgrades.sql)	(revision 14241)
+++ branches/5.1.x/core/install/upgrades.sql	(.../upgrades.sql)	(revision 14265)
@@ -2000,4 +2000,18 @@
 DROP TABLE IgnoreKeywords;
 ALTER TABLE PermissionConfig DROP ErrorMessage;
 
-# ===== v 5.1.2-B2 =====
\ No newline at end of file
+# ===== v 5.1.2-B2 =====
+
+# ===== v 5.1.2-RC1 =====
+DROP TABLE Stylesheets;
+DROP TABLE StylesheetSelectors;
+DROP TABLE SysCache;
+DROP TABLE TagAttributes;
+DROP TABLE TagLibrary;
+
+DELETE FROM Phrase WHERE PhraseKey IN (
+	'LA_FLD_STYLESHEETID', 'LA_PROMPT_STYLESHEET', 'LA_TAB_STYLESHEETS', 'LA_TITLE_ADDING_STYLESHEET',
+	'LA_TITLE_EDITING_STYLESHEET', 'LA_TITLE_NEW_STYLESHEET', 'LA_TITLE_STYLESHEETS', 'LA_TOOLTIP_NEWSTYLESHEET',
+	'LA_COL_SELECTORNAME', 'LA_COL_BASEDON', 'LA_FLD_SELECTORBASE', 'LA_FLD_SELECTORDATA', 'LA_FLD_SELECTORID',
+	'LA_FLD_SELECTORNAME'
+);
\ No newline at end of file