diff --git a/release.notes b/release.notes
index 1838e4a5d04..81ea2246b72 100644
--- a/release.notes
+++ b/release.notes
@@ -34,6 +34,11 @@ NEW: (#5042) Multi-VO mode of operation support
 *tests
 CHANGE: (#5046) don't use mail in the self generated certificates
 
+[v7r2p6]
+
+*Core
+FIX: (#5000) Display thousands separators in PrettyScalarFormatter again
+
 [v7r2p5]
 
 FIX: fixes from v7r0p56, v7r1p39
diff --git a/src/DIRAC/Core/Utilities/Graphs/GraphUtilities.py b/src/DIRAC/Core/Utilities/Graphs/GraphUtilities.py
index bde592ef680..7bd3d2089b8 100644
--- a/src/DIRAC/Core/Utilities/Graphs/GraphUtilities.py
+++ b/src/DIRAC/Core/Utilities/Graphs/GraphUtilities.py
@@ -20,11 +20,15 @@
 import pytz
 import numpy
 
+from matplotlib.pyplot import rcParams
 from matplotlib.ticker import ScalarFormatter
 from matplotlib.dates import AutoDateLocator, AutoDateFormatter, DateFormatter, RRuleLocator, \
     rrulewrapper, HOURLY, MINUTELY, SECONDLY, YEARLY, MONTHLY, DAILY
 from dateutil.relativedelta import relativedelta
 
+# This is a hack to workaround the use of float(ScalarFormatter.__call__(...))
+rcParams["axes.unicode_minus"] = False
+
 
 def evalPrefs(*args, **kw):
   """ Interpret arguments as preferencies dictionaries or key-value pairs. The overriding order
@@ -209,28 +213,17 @@ def comma_format(x_orig):
 
 
 class PrettyScalarFormatter(ScalarFormatter):
+  def __init__(self, *args, **kwargs):
+    super(PrettyScalarFormatter, self).__init__(*args, **kwargs)
+    self.set_powerlimits([-7, 9])
+    self._useLocale = True
 
-  def _set_orderOfMagnitude(self, range):
-    # if scientific notation is to be used, find the appropriate exponent
-    # if using an numerical offset, find the exponent after applying the offset
-    locs = numpy.absolute(self.locs)
+  def __call__(self, x, pos=None):
+    val = super(PrettyScalarFormatter, self).__call__(x, pos=pos)
     if self.offset:
-      oom = math.floor(math.log10(range))
-    else:
-      if locs[0] > locs[-1]:
-        val = locs[0]
-      else:
-        val = locs[-1]
-      if val == 0:
-        oom = 0
-      else:
-        oom = math.floor(math.log10(val))
-    if oom <= -7:
-      self.orderOfMagnitude = oom
-    elif oom >= 9:
-      self.orderOfMagnitude = oom
+      return val
     else:
-      self.orderOfMagnitude = 0
+      return comma_format(val)
 
 
 class PrettyDateFormatter(AutoDateFormatter):
diff --git a/tests/Integration/Monitoring/plots/ComponentMonitoringPlotter_plotPendingQueries.png b/tests/Integration/Monitoring/plots/ComponentMonitoringPlotter_plotPendingQueries.png
index 2faee998685..674e2d66c09 100644
Binary files a/tests/Integration/Monitoring/plots/ComponentMonitoringPlotter_plotPendingQueries.png and b/tests/Integration/Monitoring/plots/ComponentMonitoringPlotter_plotPendingQueries.png differ