diff --git a/EgtCalculator.xaml.vb b/EgtCalculator.xaml.vb
index 62dd298..9d4ec2f 100644
--- a/EgtCalculator.xaml.vb
+++ b/EgtCalculator.xaml.vb
@@ -223,7 +223,7 @@ Public Class EgtCalculator
       ' La calcolatrice in pollici deve essere abilitata solo se programma NON in MM e IsLength = True
       m_IsLength = m_IsLength And Not EgtUiUnitsAreMM()
 
-      If m_IsLength Then
+      If m_IsLength AndAlso nCurrFractionPattern <> FractionPattern.None Then
          DotBtn.Visibility = Visibility.Collapsed
          BackspaceBtn.Visibility = Visibility.Collapsed
          FeetBtn.Visibility = Visibility.Visible
@@ -362,7 +362,7 @@ Public Class EgtCalculator
       Dim bOk As Boolean = False
       ' se impostato per dati in frazioni
       Dim sDecimal As String = String.Empty
-      If StringFractionToStringDecimal(ValueTxBx.Text, sDecimal) Then
+      If nCurrFractionPattern <> FractionPattern.None AndAlso StringFractionToStringDecimal(ValueTxBx.Text, sDecimal) Then
          bOk = EgtUILib.EgtLuaEvalNumExpr(sDecimal, m_DoubleResult)
       Else
          bOk = EgtUILib.EgtLuaEvalNumExpr(ValueTxBx.Text, m_DoubleResult)
diff --git a/My Project/AssemblyInfo.vb b/My Project/AssemblyInfo.vb
index 580c46a..a510680 100644
--- a/My Project/AssemblyInfo.vb	
+++ b/My Project/AssemblyInfo.vb	
@@ -61,5 +61,5 @@ Imports System.Windows
 ' by using the '*' as shown below:
 ' <Assembly: AssemblyVersion("1.0.*")> 
 
-<Assembly: AssemblyVersion("2.5.2.2")>
-<Assembly: AssemblyFileVersion("2.5.2.2")>
+<Assembly: AssemblyVersion("2.5.10.1")>
+<Assembly: AssemblyFileVersion("2.5.10.1")>